Daylight-simulating incandescent lamp light fixture, particularly for medical and dental use
AssigneeW. C. Heraeus GmbH
InventorHans Eligehausen
Life of this patent
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Abstract
To permit employment of an incandescent lamp of about 3000.degree. K color temperature as a light source, the reflector reflecting light to the use area, typically an operating table, a dental chair, or the like, is constructed of a material such as glass having an index of refraction of 1.425 to 1.575, the glass readily permitting passage of infrared radiation. To provide reflected light which corresponds at least approximately to daylight, with a color temperature of 6000.degree. K., the glass is coated with a sequence of materials as set forth in table I, the materials being applied to the glass in the sequence given with increasing distance from the glass carrier, resulting in an overall reflected light of about 5500.degree. K.
Claims13
Reflector structure to provide reflected light matching at least approximately daylight when illuminated by a source of radiation having a color temperature of about 3000.degree. K, comprising
- a substrate carrier (8) of a material highly pervious to infrared radiation and having an index of refraction n.sub.d of between about 1.425 to 1.575;
- and a series of layers (9.1 - 9.6) applied to at least one side of said carrier substrate, in increasing distance from said substrate carrier,
- said layers comprising
- ______________________________________ Lay- er Index No. of Refraction Thickness of Layer Material ______________________________________ n.sub.d A about about 9.1 about 1.9 to/2.1 about 1020 to/1120 tantalum, niobium or zirconium oxide about about 9.2 about 1.4 to/1.5 about 665 to/735 silicon dioxide or magnesium fluoride about about 9.3 about 2.4 to/2.6 about 400 to/440 zinc sulfide or titanium oxide about about 9.4 about 1.4 to/1.5 about 665 to/735 silicon dioxide or magnesium fluoride about about 9.5 about 2.4 to/2.6 about 400 to/440 titanium oxide or zinc sulfide about about 9.6 about 1.4 to/1.6 about 1050 to/1155 silicon dioxide or magnesium fluoride ______________________________________
Dependencies are inferred from the claim text.